12-11-2012, 12:00 PM
Next Generation Auto Theft Prevention System using Smart Gravitational Lock, Cryptographic Keyless Entry
PPT-Gravity Lock.ppt (Size: 7.23 MB / Downloads: 567)
Working - 1
Smart Gravitational Lock – The system is armed automatically when the driver moves away from the vehicle. It is disarmed only when a specific gesture is made in the hand-held wireless key fob. The 3D gesture is made in mid-air and can be reprogrammed by the user on the fly. The air gesture is recognized using a 3-axis MEMS Accelerometer that senses the gravitational force exerted upon it. A stolen keyfob thus cannot be used to enter into the vehicle without performing the secret gesture. The password is stored in an external non-volatile serial EEPROM memory.
Cryptographic Keyless Entry – If the gesture is valid the keyfob transmits a unique encrypted code that changes every time when this gesture is made. RC4 Stream Cipher Cryptographic algorithm ensures the safety of the data transmitted. The keyfob communicates with automotive vehicle unit using IEEE 802.15.4 wireless networking protocol. This prevents thieves from detecting the static codes which were used in older keyless entry systems. The wireless packets are also used to measure the proximity of the keyfob to the vehicle.
Working - 2
Touchscreen Ignition – A dual layer keying approach is followed during vehicle ignition process. This consists of software and hardware keys. A unique touch gesture is made on the 65K Color Touchscreen TFT Display that acts as the software key. The system verifies this and then accepts the hardware key which is the actual keyfob normally used. This feature can be temporarily disabled and enabled via SMS sent by the owner. This is useful in situations such as when someone (like a mechanic) other than the owner wants to handle the vehicle and the owner does not want the other person to know the secret onscreen password. A serial EEPROM memory is used to store the password.
Adjustable Motion Alarm Sensitivity – The vehicle unit constantly monitors the vehicle motion after being armed (locked). The integrated motion sensing subsystem measures the vehicles three dimensional position and detects any unauthorized motion if the vehicles is moved or tilted that exceeds a threshold level. The sensitivity of this function can be adjusted on the touchscreen display GUI to effectively avoid any false warnings that are common with existing vehicle security systems. When someone tries to break into the vehicle forcibly, the alarm triggers the siren and head lamps and sends an SMS to the owner.
Working - 4
GPS Fencing – This feature restricts the vehicle movement within a particular area. For example, if the owner wants the car to move only within a particular city, once it moves out of city borders the owner would immediately receive an SMS alert as to the current location of the vehicle. The interesting feature here is the fence radius can be programmed by the user in the touchscreen display. This flexibility allows the user to set a virtual fence that can be at building level, street level, city level or state level.
Remote Fuel Cut-off – This feature is very useful especially in case of auto theft. If the vehicle is somehow hacked into and taken, you can send message that will slowly cut-off the fuel supply, thereby disabling the vehicle. A Servo Motor controlled valve is used to cut the fuel supply.
ARM Cortex-M3
Next Generation 32-bit ARM Processor for Embedded Applications based on ARMv7-M Architecture.
Harvard architecture.
Separate I & D buses allow parallel instruction fetching & data storage
3-stage pipeline with branch speculation.
Fetch, Decode & Execute
Integrated bus matrix.
Configurable nested vectored interrupt controller (NVIC).
Advanced debug and trace components (DAP, SWV, ETM).
Wakeup Interrupt Controller (WIC)
Memory Protection Unit (MPU)
GPS
Earth has 24 GPS satellites, atleast 4 are always visible
GPS receiver calculates location using Triangulation method
66 Channel GPS receiver interfaced via NMEA Protocol
The smart antenna can track upto 66 satellites at a time
Fast time to first fix, Superior sensitivity, and Low power
Less than 10m Accuracy
57600bps UART interface
Up to 10Hz update rate
Built-in micro battery to preserve system data for rapid satellite acquisition
LED indicator for fix or no fix
Project Advantages
Our project offers protection even when the keyfob is stolen. We call it the real smart keyfob.
This project allows us to track the vehicle even in GPS denied environments such as within buildings, underground and dense city regions.
The present day motion and tilt alarms will alert the owner even for an unintentional touch by a passing person or an accidental hit by a ball from a playing child. Our system eliminates this with adjustable motion alarm sensitivity feature.
A central user interface to configure and customize the vehicle security system which is not present in the previous vehicle designs.
All the units are powered by a 32-bit ARM Cortex-M3 Microcontroller which is low cost, low power and provides superior performance compared to the available 8, 16 and 32-bit offerings from different vendors.